Lectures: Prof. Dr. Moritz Diehl, Exercises: Nick Harder
The aim of this lecture course (6 ECTS) is that students understand the physical principles of wind energy and the technology of modern wind energy systems. It consists of lectures and exercises, and is given by Prof. Dr. Moritz Diehl and Nick Harder.
Contents:
 global wind energy resource
 aerodynamic principles of wind turbines
 design of modern wind turbines
 control of modern wind turbines
 the electrical system of wind turbines
 alternative concepts and airborne wind energy
Course Organization
The course is organized as flipped classroom. We provide recordings of the lectures and will meet once every week for either a Q&A or an exercise session. The detailed time plan for the semester can be found below. We highly recommend to follow the suggesed schedule for the lectures.
Sessions: We will meet every XXX. Please enter from the side from outdoors. These meetings are alternatingly dedicated to either Q&A sessions with Prof. Diehl or exercise sessions with Nick Harder.
Lecture recordings: The lecture recordings were already created in a past semester.
Course manuscript: The lectures are accompanied by a detailed course manuscript, which you may find here.
Q&A sessions: Every second week there will be a virtual Q&A session with Prof. Diehl, where you can ask any questions about the course content. The format is meant to be highly interactive and depends strongly on your participation. We would recommend that while watching the video lectures or reading the course script, you write down any questions that come to your mind, such that you have them readily available for the Q&A sessions.
Forum: In Ilias, we provide a forum for discussion of any questions you have related to the course, be it organization, content or exercises. Please feel free to open new topics and to answer questions of your fellow students.
Exercises: The exercises are voluntary (though of course we strongly recommend to solve them). Nonetheless we offer the possibility to hand them in to receive feedback, but for this please respect the deadlines you can find in the calendar below. If you would like feedback on a specific part of the exercise especially, you can state so on your solution sheet. To hand them in, send them in an email to: nick.harder@inatech.unifreiburg.de.
Final evaluation: The final exam is a written exam. This final exam is 'closedbook,' which means that ONLY pens, a calculator, and one A4 page (that is, two sides) of notes can be used. The questions will be partially multiplechoice and partially shortanswer.
Schedule
When 
Content 
Recordings 
Week 1 02.05  06.05 
Chapter 1: Introduction Section 1.1: Introduction (Slides) Section 1.2: Energy content of the wind Section 1.3: Power density of blade area Section 1.4: Components of modern wind turbine Section 1.5: Blade & Airfoil nomenclature 

10.05 12:30 PM 
Introduction session (Slides) 

Week 2 09.05  13.05 
Chapter 2: The Wind Resource Section 2.1: Origins Section 2.2: Global patterns Section 2.3: Mechanics of wind Section 2.4: Stable and unstable atmospheric stratification Section 2.5: Statistics of wind Section 2.6: Spectral properties of wind 

17.05 12:30 PM 
Q&A session 

Week 3 16.05  20.05 
Chapter 3: Aerodynamics of Wind Turbines Section 3.1: Wakes (Wind_wakes_image) Section 3.2: Actuator disc model and the Betz' limit


24.05 12:30 PM 
Exercise session 1 

Week 4 23.05  27.05 
Section 3.3: Wake rotation & rotor disc theory Section 3.4: Blade element momentum (BEM) theory 

31.05 12:30 PM 
Q&A session 

Week 5 30.05  03.06 
Section 3.4: Blade element momentum (BEM) theory


14.06 12:30 PM 
Exercise session 2 

Week 6 13.06  17.06 
Section 3.4: Blade element momentum (BEM) theory 

21.06 12:30 PM 
Q&A session 

Week 7 20.06  24.06 
Chapter 4: Mechanics & Dynamics of Wind Turbines Section 4.1: Steady loads in normal operation Section 4.2: Stress and strain Section 4.3: Static beam bending 

28.06 12:30 PM 
Exercise session 3 

Week 8 27.06  01.07 
Section 4.4.1: Intro: springmassdamper system Section 4.4.2: Eigenmodes Section 4.4.3: Rayleighs method Section 4.4.4: Dynamic beam equation Section 4.4.5: Tower eigenmodes Section 4.4.6: Stiff & soft towers Section 4.5: Blade oscillation & centrifugal stiffening


05.07 12:30 PM 
Q&A session 

Week 9 04.07  08.07 
Chapter 5: Control of Wind Turbines Section 5.1: Sensors and Actuators in wind turbines Section 5.2: Control system architecture Section 5.3: Control of variable speed turbines 

12.07 12:30 PM 
Hike to wind turbines on Rosskopf 
Details 
Week 10 11.07  15.07 
Section 5.4: Torque control at subrated power
Section 5.5: Thrust jump at nominal wind speed 

19.07 12:30 PM 
Exercise session 4 

Week 11 18.07  22.07 
Chapter 6: Alternative Concepts Section 6.1: Vertical axes wind turbines Section 6.2: Airborne Wind Turbines


26.07 12:30 PM  Summary session or Exercise session on mock exam 
Special Events

The tour to the wind turbines on Rosskopf will take place on July 12 afternoon.
Resources
Wind Energy Handbook is available here.
Wind Energy Explained: Theory, Design and Application is available here.
Links of interest
20200512 Report on renewable power generation costs in 2018 (by IRENA) (PDF)
20200519 Which way a wind turbine turns might not seem to matter (by the Economist) (screenshot)
20200519 Atmospheric circulation patterns (from wikipedia)
20200526 Article on the Global Energy Transition (by the Economist)
20200602 Albert Betz: WindEnergie. Cover, Turbine Illustrations, Concluding Sentence